CVE-2025-9187
published 2025-08-19CVE-2025-9187: Memory safety bugs present in Firefox 141 and Thunderbird 141. Some of these bugs showed evidence of memory corruption and we presume that with enough effort…
PriorityP345critical9.8CVSS 3.1
AVNACLPRNUINSUCHIHAH
EPSS
0.49%
40.9th percentile
Memory safety bugs present in Firefox 141 and Thunderbird 141. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 142 and Thunderbird 142.
Affected
4 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | firefox | < firefox 142.0-1 (sid) | firefox 142.0-1 (sid) |
| mozilla | firefox | < 142.0 | 142.0 |
| mozilla | firefox | — | — |
| mozilla | thunderbird | < 142.0 | 142.0 |
CVSS provenance
nvdv3.19.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
osv9.8CRITICAL
vendor_debian9.8CRITICAL
vendor_redhat9.8CRITICAL
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Red Hat
firefox: thunderbird: Memory safety bugs fixed in Firefox 142 and Thunderbird 142
vendor_redhat·2025-08-19·CVSS 9.8
CVE-2025-9187 [CRITICAL] CWE-119 firefox: thunderbird: Memory safety bugs fixed in Firefox 142 and Thunderbird 142
firefox: thunderbird: Memory safety bugs fixed in Firefox 142 and Thunderbird 142
Memory safety bugs present in Firefox 141 and Thunderbird 141. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 142 and Thunderbird < 142.
A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
Memory safety bugs are present in Firefox 141 and Thunderbird 141. Some of these bugs showed evidence of memory corruption, and we presume that with enough effort, some of these could have been exploited to run arbitrary code.
Statement: Red Hat Product Security rates the severity of this flaw as determined by
Debian
CVE-2025-9187: firefox - Memory safety bugs present in Firefox 141 and Thunderbird 141. Some of these bug...
vendor_debian·2025·CVSS 9.8
CVE-2025-9187 [CRITICAL] CVE-2025-9187: firefox - Memory safety bugs present in Firefox 141 and Thunderbird 141. Some of these bug...
Memory safety bugs present in Firefox 141 and Thunderbird 141. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 142 and Thunderbird < 142.
Scope: local
sid: resolved (fixed in 142.0-1)
Mozilla
Mozilla Foundation Security Advisory 2025-64: CVE-2025-9187
vendor_mozilla·CVSS 9.8
CVE-2025-9187 [CRITICAL] Mozilla Foundation Security Advisory 2025-64: CVE-2025-9187
Mozilla Foundation Security Advisory 2025-64
CVE: CVE-2025-9187
Product: Firefox
Impact: high
Fixed in: Firefox 142
Mozilla
Mozilla Foundation Security Advisory 2025-70: CVE-2025-9187
vendor_mozilla·CVSS 9.8
CVE-2025-9187 [CRITICAL] Mozilla Foundation Security Advisory 2025-70: CVE-2025-9187
Mozilla Foundation Security Advisory 2025-70
CVE: CVE-2025-9187
Product: Thunderbird
Impact: high
Fixed in: Thunderbird 142
VulDB
Mozilla Thunderbird up to 141 memory corruption (Nessus ID 258109 / WID-SEC-2025-1866)
vuldb·2026-10-02·CVSS 9.8
CVE-2025-9187 [CRITICAL] Mozilla Thunderbird up to 141 memory corruption (Nessus ID 258109 / WID-SEC-2025-1866)
A vulnerability described as critical has been identified in Mozilla Thunderbird up to 141. This affects an unknown part. Such manipulation leads to memory corruption.
This vulnerability is documented as CVE-2025-9187. The attack can be executed remotely. There is not any exploit available.
Upgrading the affected component is recommended.
VulDB
Mozilla Firefox up to 141 memory corruption (Nessus ID 258109 / WID-SEC-2025-1866)
vuldb·2026-10-02·CVSS 9.8
CVE-2025-9187 [CRITICAL] Mozilla Firefox up to 141 memory corruption (Nessus ID 258109 / WID-SEC-2025-1866)
A vulnerability marked as critical has been reported in Mozilla Firefox up to 141. Affected by this issue is some unknown functionality. This manipulation causes memory corruption.
This vulnerability is registered as CVE-2025-9187. Remote exploitation of the attack is possible. No exploit is available.
It is suggested to upgrade the affected component.
GHSA
GHSA-6rqq-g95r-qrcc: Memory safety bugs present in Firefox 141 and Thunderbird 141
ghsa_unreviewed·2025-08-19
CVE-2025-9187 [CRITICAL] CWE-119 GHSA-6rqq-g95r-qrcc: Memory safety bugs present in Firefox 141 and Thunderbird 141
Memory safety bugs present in Firefox 141 and Thunderbird 141. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 142 and Thunderbird < 142.
OSV
CVE-2025-9187: Memory safety bugs present in Firefox 141 and Thunderbird 141
osv·2025-08-19·CVSS 9.8
CVE-2025-9187 [CRITICAL] CVE-2025-9187: Memory safety bugs present in Firefox 141 and Thunderbird 141
Memory safety bugs present in Firefox 141 and Thunderbird 141. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 142 and Thunderbird < 142.
No detection rules found.
No public exploits indexed.
2025-08-19
Published